interfaces: can: rework packet buffer freeing
interfaces: can: rework packet buffer freeing

GomSpace/libcsp,Psykar/kubos,pacheco017/libcsp,GomSpace/libcsp,pacheco017/libcsp,Psykar/kubos,Psykar/kubos,Psykar/kubos,satlab/libcsp,Psykar/kubos,pacheco017/libcsp,libcsp/libcsp,satlab/libcsp,satlab/libcsp,kubostech/KubOS,Psykar/kubos,pacheco017/libcsp,Psykar/kubos,libcsp/libcsp,kubostech/KubOS,GomSpace/libcsp